Patent GB-410786-A (GB)
Title: Improvements in connection with diving apparatus
IPC: B63C11/02
Filed: 1932-11-19
Abstract: 410,786. Driving-apparatus. SAXTON, M. C., 17, Onslow Street, Rose Bay, near Sydney, Australia. Nov. 19, 1932, Nos. 32765 and 32766. Convention dates, Nov. 20, 1931 and Dec. 7, 1931. [Class 68 (ii).] In diving-apparatus of the dual type having a respiratory chamber and a buoyancy chamber disposed one inside the other, the air supply to the chambers is independently controlled by manually operable valves and the valve controlling the supply to the buoyancy chamber is a three way valve which is adapted to admit air from the pipe line, allow air to escape, or to retain the air pressure at any required amount. The usual outlet valve is provided on the respiratory chamber, and a special safety valve may be fitted to both chambers. Fig. 1 shows diagrammatically one arrangement of the apparatus in which R indicates the respiratory chamber, and B the buoyancy chamber. The air line 25 is connected through a manually operable valve 38 to a pipe line 73 which connects through a check-valve 53 with the respiratory chamber and to a pipe line 75 which connects through a check-valve 54 and the manually controlled three way valve B.V. with the buoyancy chamber. The usual outlet valve is shown at 27, and 26 is a safety valve. In a modification the line 75 may be joined to the air line 25 in front of the valve 38 and the air line may be provided with a check-valve. One construction of the valve 38 is shown in Fig. 3 and comprises a casing formed in two parts 28, 29 bolted together with packed joints. The part 28 comprises a needle valve 38, which may have a byepass construction connecting the main air passage 42 with a chamber 43, which connects with two chambers 69, 70 in the part 29 through valves 53, 54. The chambers 69, 70 communicate respectively with the respiratory chamber and the buoyancy chamber. A socket 68 on the part 29 connects with the main air line. Modifications are described in which the chamber 70 is in direct communication with the main air line, and in which the passage 42 is fitted with a spring-controlled valve. The manually controlled three-way valve B.V. is shown in one form in Fig. 12 and comprises a conical casing 82, and plug 83. The casing has a passage 84 from the air line and a passage 85 leading to the buoyancy chamber. The plug 83 has an axial passage 100 and two lateral passages 101, 102 by which the buoyancy chamber can be put in communication either with the air line, or a spring controlled outlet valve 92, or can be closed to both. The operating handle may be formed of a shape which indicates to the touch the position of the valve. In order to ensure the lifting of the outlet valve, a byepass may be provided connecting the air-line to the outlet valve when the three-way valve is in position to open the buoyancy chamber to the atmosphere. The construction of safety valve 26 is shown in Fig. 21, and comprises a casing 111 which is welded in the chamber wall and is closed by screwed caps 119, 114. The cap 119 is formed with a seating and guides for a spring controlled valve 123. Outlet openings 112, 116, and a stop 117 are provided on the casing 111 and cap 114 respectively.